What do B lines indicate?
B lines, previously termed ”comet tails,” are vertical hyperechoic reverberations moving synchronously with the lung and represent key artifacts in interpreting pulmonary ultrasound findings [3,4]. The physiologic basis of B lines relates to decreased lung aeration [5], a finding that is nonspecific.
What causes B lines on ultrasound?
In the presence of extravascular lung water (EVLW), the ultrasound beam finds subpleural interlobular septa thickened by edema. The reflection of the beam creates some comet-tail reverberation artifacts, called B-lines or ultrasound lung comets.
How many B lines are significant?
The detection of 10 B-lines is highly predictive for the HRCT presence of significant SSc-ILD. In SSc patients, the LUS assessment as first imaging tool may represent an effective model to improve the correct timing of chest HRCT.
What are a lines and B lines on ultrasound?
The A-line is a horizontal artifact indicating a normal lung surface. The B-line is a kind of comet-tail artifact indicating subpleural interstitial edema. The relationship between anterior interstitial edema detected by lung ultrasound and the pulmonary artery occlusion pressure (PAOP) value was investigated.
How are B-lines formed?
The multiple bright, moving, echogenic lines that start at the pulmonary surface and extend to the extreme depths of the ultrasound image are created by short path reverberation artefact. It is occurring within fluid filled alveoli that are moving with each respiratory cycle. When in the chest these are called B-lines.
Are B-lines normal?
A few B-lines (<3/field of view) can often be found under normal circumstances, especially in the elderly, and around the base of the lungs 4.
How are B lines formed?
Are B lines normal?
What is lung point?
The junction between sliding lung and absent sliding is known as the lung point and identification of this is near 100% specific for pneumothorax and also gives an indication of pneumothorax size by its location.
What do Kerley B lines indicate?
Kerley B lines (arrows) are horizontal lines in the lung periphery that extend to the pleural surface. They denote thickened, edematous interlobular septa often due to pulmonary edema.
Can atelectasis cause B lines?
A few B lines originating from an atelectasis erase the normal A lines. For more details see text. Localized iso- or hypoechoic areas as compared with the highly reflective or anechoic normally aerated lung tissue. This consolidation or tissue-like pattern is caused by a loss of lung aeration.
What is a line and B line?
The A-line is a horizontal artifact indicating a normal lung surface. The B-line is a kind of comet-tail artifact indicating subpleural interstitial edema.